#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

// Inisialisasi LCD (alamat I2C 0x27, ukuran LCD 16x2)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pin DHT-22
#define DHTPIN 2
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// LED Peringatan
#define LED_PIN 13

// Batas suhu dan kelembapan
#define TEMP_THRESHOLD 30.0
#define HUM_THRESHOLD 70.0

void setup() {
  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();

  // Inisialisasi DHT
  dht.begin();

  // Inisialisasi LED
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  // Menampilkan pesan awal di LCD
  lcd.setCursor(0, 0);
  lcd.print("Monitoring...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Membaca suhu dan kelembapan
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // Validasi pembacaan sensor
  if (isnan(temp) || isnan(hum)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error");
    delay(2000);
    lcd.clear();
    return;
  }

  // Menampilkan data di LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Hum:  ");
  lcd.print(hum);
  lcd.print("%");

  // Logika peringatan
  if (temp > TEMP_THRESHOLD || hum > HUM_THRESHOLD) {
    digitalWrite(LED_PIN, HIGH); // Nyalakan LED
    delay(200);
    digitalWrite(LED_PIN, LOW); // Nyalakan LED
    delay(200);
  } else {
    digitalWrite(LED_PIN, LOW); // Matikan LED
  }

  // Tunggu 2 detik sebelum pembaruan
  delay(2000);
}